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Add note to low-level client docs for DNS caching (#29213) 

This commit adds a note to the low-level REST client docs regarding the
possibility of being impacted by the JVM DNS cache policy under a
default security manager policy.
This commit is contained in:
Jason Tedor 2018-03-22 21:23:52 -04:00 committed by GitHub
parent 14157c8705
commit a9677023da
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13
docs/java-rest/low-level/configuration.asciidoc
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@ -86,3 +86,16 @@ will be used.
For any other required configuration needed, the Apache HttpAsyncClient docs
should be consulted: https://hc.apache.org/httpcomponents-asyncclient-4.1.x/ .
NOTE: If your application runs under the security manager you might be subject
to the JVM default policies of caching positive hostname resolutions
indefinitely and negative hostname resolutions for ten seconds. If the resolved
addresses of the hosts to which you are connecting the client to vary with time
then you might want to modify the default JVM behavior. These can be modified by
adding
http://docs.oracle.com/javase/8/docs/technotes/guides/net/properties.html[`networkaddress.cache.ttl=<timeout>`]
and
http://docs.oracle.com/javase/8/docs/technotes/guides/net/properties.html[`networkaddress.cache.negative.ttl=<timeout>`]
to your
http://docs.oracle.com/javase/8/docs/technotes/guides/security/PolicyFiles.html[Java
security policy].